Visual Systems Division
Technical Bulletin
MultiSync
LT140 Installation Data
Desktop and Ceiling Mount
Page1
Contents
Notes and Formulas Page 1
Projection Distances and Screen Sizes
Desktop Setup Page 2
Ceiling Mount Page 3
Cabinet Dimensions Page 4
Notes
§
For Screen Sizes of 25 to 300 inches not indicated on the projection tables, use the formulas below.
§
Set the projection distance based on the width of the screen.
§
If the figures on the tables do not match the figures in the formulas, use the figures in the table.
§
All dimensions are in inches. Multiply by 25.4 for millimeters.
§
Distances may vary +/- 5%.
Formulas
Units: Inches
A
= C / COS
α
H
= Screen Diagonal (4:3) x 4 / 5
B
= 3.7H / 25.4
H
= Screen Width
C (WIDE)
= (2.0099 x H) – 1.9927
C (TELE)
= (2.4119 x H) – 2.0365
D
= E/2
E
= H / 4 x 3
α
α
= TAN
-1
((H x 0.375) + B) / C
A
= Distance between lens center and screen center
B
= Vertical distance between lens center and screen bottom (screen top for ceiling mount)
C
= Horizontal throw distance between screen surface and projector lens
D
= Vertical distance between screen center and screen bottom (screen top for ceiling mount)
E
=
Screen Height
α
α
= Offset Angle of image path center line with reference to desktop or ceiling
